Physics – Condensed Matter – Superconductivity
Scientific paper
2010-03-20
Phys. Rev. Lett. 106, 187002 (2011)
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.106.187002
We have performed photoemission studies of the electronic structure in LiC$_6$ and KC$_8$, a non-superconducting and a superconducting graphite intercalation compound, respectively. We have found that the charge transfer from the intercalant layers to graphene layers is larger in KC$_8$ than in LiC$_6$, opposite of what might be expected from their chemical composition. We have also measured the strength of the electron-phonon interaction on the graphene-derived Fermi surface to carbon derived phonons in both materials and found that it follows a universal trend where the coupling strength and superconductivity monotonically increase with the filling of graphene $\pi^{\ast}$ states. This correlation suggests that both graphene-derived electrons and graphene-derived phonons are crucial for superconductivity in graphite intercalation compounds.
Camacho J. J.
Ellerby Mark
Fedorov Alexi V.
Howard Christopher A.
Pan Z.-H.
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